A note that Boston Marathon bombing suspect Dzhokhar Tsarnaev is said to have left on an interior wall of the boat where police found him after the April 15 attacks claimed responsibility for the bombings and described them as retribution for the U.S. wars in Iraq and Afghanistan, saying the Boston dead were “collateral damage” in the same way Muslims are in the American-led conflicts.

“When you attack one Muslim, you attack all Muslims,” Tsarnaev allegedly wrote.

The apparent admission that Tsarnaev and his older brother Tamerlan, a fellow suspect who was killed in a shootout with police, waged the attacks as an act of vengeance would qualify the tragedy as a blowback event, in which violence perpetrated on Americans or their interests at home or abroad is a response to U.S. military aggression and government meddling in the affairs of other nations.

CBS senior news correspondent John Miller explained the possible significance of the note in a trial against Tsarnaev.

— Posted by Alexander Reed Kelly.

CBS This Morning:

According to Miller, the note will be a significant piece of evidence in any Dzhokar trial — it is “certainly admissible,” and paints a clear picture of the brothers’ motive, “consistent with what he told investigators while he was in custody,” Miller said Thursday on “CBS This Morning.”

Miller explained that while Dzhokar admitted many of the same details to authorities during his 16 hours in custody, those admissions came “during the time he was interrogated but before he was given his Miranda warning.” The note gives prosecutors supporting and clearly admissible evidence even if there is an fight over whether things Dzhokar said before he was given his Miranda rights are admissible as evidence.

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CBS This Morning:

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